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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3251b41441587af50ef51d3b836cbbbe36e36fdbb25d49692afd4da14c41eb25' 
  AND token = 'UA3HHnplWIXRRYcCXgluQ8eCGkBzheMRAAc7k3NXB9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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