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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c7b6197dc0b50ee844b65c9b26539ae0302b2ff44817e97c45387469fcdc3fb6' 
  AND token = 'Hh44whpATKfQ36JhAp7fb5HjZqVmkL2tOO1jo9ubwmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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