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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '306b160b0b4d0e67ca7d5babf40f3ac64ea1786f07fc175fe6d51390427a10af' 
  AND token = 'XTkSzB9p4pf2BQRTpk4DTh694wv+DZktJVP01xtu97E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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