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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87046800426ca9f51e744aa81c78a5c29f7bf47778d27b3f569ae41954785e00' 
  AND token = '4EcrKYkzJpjMsOLhHFAJ7ocu1TlM/kWZGJTkczfOI2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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