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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '75b24c42dc834d1d22cbe5b9a7ee6479abf0fd2bf5c013f6f5f8cbdfab160a52' 
  AND token = 'qz0KtLNKPIDM2DF/3PjRETEbyn0jLsG0Q4dSKIelgcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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