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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f2338fb2cd524b89185d4d190941a1992d7d10841110d3dba2dd1c4420492998' 
  AND token = 'JFwZ2M96rs8pD3j2Pl3f/aZ2PhDoTY4LsRkADQlcATk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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