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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1861827f67efbde4b66cc553f06f5ca90b45ce4c6f5c0fbe6fee397ba3e1c0cb' 
  AND token = '1tYs9OYK0tBTWc/Z3YSPUurrsZGQ05fAZcuUyH48p6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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