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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '062ccbf8f7e5c572744a1d6141028a80abf41f4b70ceb39e24c858c231b19a25' 
  AND token = 'Frx09Pw1cLDHusrwLpyEOmYgBg0H6XCTsdc19ydUph8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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