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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6156fd3613c0e127d9cee2c4dbc0e23b6b0e34d05b5e486c473e997a754b6ade' 
  AND token = 'b+ry+oDifCHXi3R3QNY1FwqHNIQ1U24nEAdasWKwnik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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