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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c322f054d54882e67b999c4593706147b1b6312434599e8e684dc198d0d3d75' 
  AND token = 'U4VxBM9Lj9pI1eVP1/pz0y3K8OoefaRsMniU8FUTglc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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