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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '0e03948910ef253279b0f59fe62ceb70376093812ef1d755b528465f9dc0a5c5' 
  AND token = 'oyDMQrqdLt/fCDg1vmn9eckQlUZ1izcGin7rprV8GqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}