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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7738bb9fe1220e0897f57428d5c87ca63fb8e61aba8f25358e6585cebd5b878f' 
  AND token = 'XWkiuX+oSz/1Z5v0SZhKo284Uw/Xieq2D0n4e+xb5ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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