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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c5db4c2541a71f488de835ced11d1423cd7d290e1fa24acaf7680d376e6919ed' 
  AND token = '4LXSP/0DjoTY6Nvm4R8yMwvjBiU6+M4Y/De61kEslhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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