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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '56892834399e6a16af292d8a4fc62923a2291b66e451d681014c3405e2f36061' 
  AND token = 'o3FIDKPTOtpqrMGP4l42f14u4HKPm47r0TGOqnK/gss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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