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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dfb30ea88f396311fb24c3fe60374722f2946f50c08cec4aa34e141ff92d3fd4' 
  AND token = 'cCpmz1gxYICU7Q3YV7BYVEy94zahbE6h16S6PmoWkVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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