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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fa30a7ac06331023a566bb4ede6a8d2d0c5a8a286f11c6c63a8e525ce2e8a6c5' 
  AND token = 'R0R8U4WWfByTX2P/LDzc+K1I/QbX7fKBWPY7ju+73To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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