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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '959f3f335ca3e6226c28085462b126887108c5cee5a6b3b7435906f417c0ded8' 
  AND token = 'WbuanchCAeKpa4KChl1657rpS3URKg3uLIUtLxYONB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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