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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e88e9197493312c6a9fac13f7ab6bf280badc826747b70ebb10481d203670c84' 
  AND token = '4ru2dQoRgSak22V/DSLMX0QECcHJ8KO69jbT9QXRKpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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