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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a62fb9e02d77923fc2182064d590de0de854f2cbc60df66fcc66f0112189345b' 
  AND token = 'LpaFy0wf2+9rwcFFCN9YrZKQxomdmI2GsFOCWU6S3LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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