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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6a612191cba32bc9235ab91c6fcb4f490ff489b5edca9cca3571934a6e5ce2b' 
  AND token = 'ZBJS3voUdrnEsEi8Y8BUProTrnNqWjwkTUQVuMsppew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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