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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b7762472decdfbc70ca4e7aa3a8f53e82d9ef4252ca26044bbd8df44886c0bd3' 
  AND token = 'ZQDCB8qj8V+8FKS8OvVSVSnbnZKgy772lG4TpMR1GQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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