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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4a5656ffdfb0a925d28b5b1aaa9f4649f3bf42bf68e060af5e3e4649da44f5a6' 
  AND token = '0Vv0xJLbG+24cjUVatsv57ytq09M9n/uQqw+Dhg4bxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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