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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '68e69d202d442071fb74e64362cd903040f2043a88533da5600d05a0fe92d786' 
  AND token = 'FmifSrlwAxeJxed5RxV4j00YQazHFLTN6vctEHSVyYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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