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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '93b9d5e8be1e166f041467830ef873fdf3ee47efbf2ae627f6e19184c0cdbb56' 
  AND token = 'af1QJ0bhQYTmfLQQnZM1YApxxm9qGqu/e3s+T2BsX8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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