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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0ffdca1057c30993f674d08675034f2d4994196f9514f4a2a1e175f2f5607b40' 
  AND token = 'gNpRyi+TSXtsNBZmSdZ12/MWHWFpGjpa6S6vgd1NGok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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