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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e9c0a316be66e8bf9471f1ef87a2bfb0731248091270d477ea0118618ae040b3' 
  AND token = 'RB74KFuyi1ztkOQ7QRyLyvUysDdQP4/3X+nwLVZzh48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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