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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '60ebb0c16df4a5d7d381c0ce08460c50e3dc1d3c2499165ed5be670f2d0b911a' 
  AND token = 'MuV9I4eLLUaIzEyZMae9KSodczWoovQJA5NW36ed574=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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