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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fda7a8669ff012261bad4670c7abc3d0433aa670cc752df70f2c68557eea1ac2' 
  AND token = 'uYN5u0It5CN2cW4NcGiM5C+MVSu+n7ScfcyKcUDcXaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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