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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9a50d56c084e527c07aa87b0d2857e02a6cbf07eda34446bcab780d82a9aba14' 
  AND token = 'BRjE0fzKzGPTPdtRzvdW5sE1mkou+KX6imA+1aSRr4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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