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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '332091f1a33f0e8288fff80694acd222e6e3e6c99efe30cf40e616da497469dc' 
  AND token = 'vkGqIDA/HCG01Vqdjh4xWMVvuuq0kNBMmtcUSHFpxIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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