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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7da269016936fb33235471105ea0e8e34cbd0d1cdb54b63df0c216cde967ce70' 
  AND token = 'mcg/BQmMFMIRH3xCAHvMdSmTlrft+mvA8/ULO9O5rUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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