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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bca6201d1e30308065f47e3de3c4b0d4296121870288969efd48e40f154f81eb' 
  AND token = 'U9di3QnN40Xi/zE76Uyl85TLLOmc7m2078UwefJ7FD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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