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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0b241314250b9c428019f171384f00411c4ba9856db8d0a883ac18278b3e3e4e' 
  AND token = '0LTRf4LIsXcsM4m3bPEgUC+4M4RwiRvCItaUGDjV9UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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