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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bb1c78a3bacddd242cd5c4edad14e7ba802abdd63989591668fbd9caed017866' 
  AND token = 'ZXtbvUJEnZq5HKH+x1Cl9DpqZFnEaOBbTkgBLOwbD6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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