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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd53846e687a07f8661e89d316c3f8f2690ca19c7236169951a683bf576962e0' 
  AND token = 'scpfT2ULJX4FzP5oB0q2ZQf2o0n5HBavoiNycVR4bos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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