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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c075532e29feb53a33f89deb35de55266c048e9d45e88788c20b61c832c8d16' 
  AND token = 'vUl+zgmpnfx6o9bwzRpUi1eFWVXcniX/THRSXpd1mCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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