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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ae92df46fd6c56dd91209b6e0bd4666667afc00ce728ace5837b2996664f1139' 
  AND token = '7yqxctQ0gYYGYXn3byh5Oo1GXLEUejkj3c0vxUp1+JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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