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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0eca37b3fe0e814eb1bf67c1c6a43f669db5867f3aed319dab3ec68e7c04e746' 
  AND token = 'SPCttjo22pAjkFYkJwC42qgaSiLt4wdVqpGzd6IJ9EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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