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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b0e8be85d7adff8fa02631f60e3353d6be40963bd7f94c78157cdb64ea28ecc5' 
  AND token = 'ty95le7W9JuJRs7sc8wqhyvFydqGQRRxjkqQmd7XA2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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