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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce64d3d51f094915ffa1b288df557a9829fd3c2da81b95f0f8fb073c92331494' 
  AND token = 'q7hJffHgXdIFkyvcie/xS8wQqTeVub9Cm+3HHord9Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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