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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6bf8b67ff195a118d3353da8335512b510b70b8a3dbe6f508add2f6b0dcbd598' 
  AND token = 'FAfOujjNVXNjnNwAA0M/GpVvu4rRaIaxmD7jmnrxpPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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