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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6f9a4843b280bb592c2e09021778aac50ff48778f797fa42df69fc0ce797f78e' 
  AND token = 'JX9O6sRQOPsSZO6mQliwS4W/ZJ0UZcgU58W4XXjeFZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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