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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'de1c80f423947203359edac68d2d9e5f918667a5608fc06163848594b1aaa61c' 
  AND token = 'YLZRNVFk80K1qRlSMjTF4asBAo3lMfKE1sMKi8UXBLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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