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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7e1e88889fa4091690ccfa55c1e3dd3a1fe9ecb5ce855ace93f81fed43d4d880' 
  AND token = 'FS5OQiEjjqtQI5D7WrSltYdINtRT/IzRf52FApcBcLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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