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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6f590fa170268a5db81821ee382facc4b521985d38428fe90b2e2d1686590cd6' 
  AND token = '9Hi3HT3/09snGa1ERy87W6d65xu2WZZmwc7GzXXs/Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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