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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'be4cc21df94a4f622f84e2155427afb211938616da067ac8ea1ed3faee6615a2' 
  AND token = 'n2krvbl/8itK7Qt9byysYVKuEoOyAT7+L95HpTnADpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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