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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '89ddd37f69cdcf4ad2d1d2ad1075cc01e79845b2807e8812793462f0c5dcf2ac' 
  AND token = 'n0o7AImSK0f4RCgXXM36aKgUN78F4SkI2bx0zy5btr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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